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As i´m driving a 3L steptronic, my gear ratio is somewhat high even for a torque-based engine like the m54b30, i would want to raise the differential gearing to 3.91:1. the car would max out at around 170mph which is pretty hard to reach even on our autobahnen.

so i contacted a few companies who offer limited slip differentials and drexler was the one who has shorter gearing AND lsd.

sadly they want me to pay 3200€

question now is, is there a company overseas or in uk or elsewhere which sells a lsd and a shorter gearing?

Yes a company over seas sells 3.91s.. It's BMW from the 2.5 auto x3. The Legend Kpeng has done this swap on his 330i. Here is a link for you, as far as lsd. I don't know. http://www.bokchoys.com/differential/diy_diff_x3.htm
Good Luck OP EDIT just realized... for that price you can get a m3 rear sub frame all the goodies with it. Buy a 3.91 for an m3 and still have some cash.